A numerical simulation of electron cyclotron current drive in HL-2A tokamak is performed with the relativistic FokkerPlanck equation incorporated into a ray tracing code. With the singlenull divertor configuration on the HL-2A tokamak

the current dirve for the ordinary electron cyclotron wave

injected from the low field side

are analyzed. Numerical results show that current drive efficiency is low and can be affected dramatically by the change of temperature in HL-2A.