Why MY ipad don't charge on usb port, on Macbook pro

why MY ipad don't charge on usb port, on Macbook pro

Because the port you're using just isn't putting out enough juice. The Power Adapter which came with your iPad puts out 2A of charging current, while the most powerful USB port on any computer is going to be putting out 500mA at most (and many brands, especially PC laptops, put out considierably less).
That's why your User's Guide recommends you use the Power Adapter.

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      PCI Device ID:          0x1c2d
      PCI Revision ID:          0x0005
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      Vendor ID:          0x05ac  (Apple Inc.)
      Version:           5.16
      Serial Number:          CC2BA30DEXDG6LL0
      Speed:          Up to 480 Mb/sec
      Manufacturer:          Apple Inc.
      Location ID:          0xfa200000 / 3
      Current Available (mA):          500
      Current Required (mA):          500
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      Vendor ID:          0x0424  (SMSC)
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      Speed:          Up to 480 Mb/sec
      Location ID:          0xfa100000 / 2
      Current Available (mA):          500
      Current Required (mA):          2
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      Vendor ID:          0x0a5c  (Broadcom Corp.)
      Version:           1.00
      Speed:          Up to 12 Mb/sec
      Manufacturer:          Apple Inc.
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      Manufacturer:          Apple Inc.
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      Current Required (mA):          0
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      Current Required (mA):          40
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      PCI Revision ID:          0x0005
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      Speed:          Up to 1.5 Mb/sec
      Manufacturer:          Apple Computer, Inc.
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      Current Required (mA):          100
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              8 GB RAM
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    Disk Information:
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                        disk0s1 (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) /: 499.25 GB (234.19 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
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    USB Information:
              Apple Inc. FaceTime HD Camera (Built-in)
              Apple Inc. BRCM2070 Hub
                        Apple Inc. Bluetooth USB Host Controller
              Apple Inc. Apple Internal Keyboard / Trackpad
              Apple Computer, Inc. IR Receiver
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              com.squirrels.airparrot.framebuffer          (3)
              com.protech.NoSleep          (1.3.3)
              com.jft.driver.PdaNetDrv          (1.0.64)
              com.Cycling74.driver.Soundflower          (1.6.2)
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              [loaded] com.adobe.fpsaud.plist
              [loaded] com.mice.360Daemon.plist
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              [loaded] org.macosforge.xquartz.startx.plist
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              [loaded] com.google.keystone.agent.plist
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              VMware Fusion Helper
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              FlashPlayer-10.6.plugin
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              JavaAppletPlugin.plugin
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              QuickTime Plugin.plugin
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              1.69 GB            Active RAM
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              1.18 GB            Wired RAM
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