Hey this is tushar,
                as per dji recomended i bought MI tab with os version 4.4.4 and the recommended os verson is 4.2.1 or later,The google app store is showing the aap is not compatible with this device.I did a live chat with DJI and they told me its compitable with MI pad so i bought it.Now what shal i do?

You can try downloading the app from the DJI site here: Inspire 1 downloads

You'll find the DJI Go app on there, download it and open the downloaded file with a file manager to install it. You may need to change the setting to allow, "Install from other locations" in your tablet, it may be named differently.