hello friends . i am using flysky radio and receiver. i crash some model because i cant get the range between radio and receiver . how to check range for receiver. need help urgently.

Instructions would have come with your radio.

For AM/FM & PCM/PPM radios, put the antenna down and walk about 100 feet, then operate the sticks. If all servos work without glitching then the range is OK. In 2.4 Ghz radios, there is a "power down" switch for this as there is no extendable antenna

I am not familiar with your specific radio, but the procedure for power down must be there in the manual

can u explain abut power down

The power down option is not there in your flysky radio..
You can check the range mannually only..
Check this out   
http://www.rcgroups.com/forums/showthread.php?t=1287472