From 2000 to 2010 , monitoring of radio emission from the Crab pulsar at Xinjiang Observatory detected a total of nine glitches .
The occurrence of glitches appears to be a random process as described by previous researches .
A persistent change in pulse frequency and pulse frequency derivative after each glitch was found .
There is no obvious correlation between glitch sizes and the time since last glitch .
For these glitches \Delta \nu _ { p } and \Delta \dot { \nu } _ { p } span two orders of magnitude .
The pulsar suffered the largest frequency jump ever seen on MJD 53067.1 .
The size of the glitch is \sim 6.8 \times 10 ^ { -6 } Hz , \sim 3.5 times that of the glitch occured in 1989 glitch , with a very large permanent changes in frequency and pulse frequency derivative and followed by a decay with time constant \sim 21 days .
The braking index presents significant changes .
We attribute this variation to a varying particle wind strength which may be caused by glitch activities .
We discuss the properties of detected glitches in Crab pulsar and compare them with glitches in the Vela pulsar .