I checked the polarization with PBS, found out that we are using the p in infrared and s in green.So the dichoric mirror should be changed.
Then I checked the infrared power at different position with less output power of laser.The result:
Laser-(808.3mW)-waveplate-(795.5)-waveplate-(794)-Faraday Isolator-(728.4)-waveplate-(650)-EOM-(517)-BS mirror-\(429.4)-(399,6)-lens1-(331.9)
-mirror/-(323.2)-lens2-(307.9)-waveplate-(303.0)-lens3-(299.2)-mirror\-(293.7)-dichoric mirror-/-(292.8)-SHG
Between the BS mirror and the lens1, the power seems reduce with the distance.
And after checked the power, I found out I lost the alignment seriously. No matter how I change, the TEM00 cannot get larger. I think I did not move the cavity, but I cannot find other reason for this situation.