Monte Carlo method has been widely used to simulate t he BRDF value of vegetation canopy in the field of visible remote sensing. This paper discusses how to use Monte Carlo method to simulate the thermal radiant di rectionality of the continuous vegetation. Based on two preconditions: the loca l thermal equilibrium is satisfied and emissivities do not change with temperatu re

the component effective emissivities of winter wheat and soil had been calcu lated by Monte Carlo method which can describe the transfer process of photon. T hen the radiance L（θ） of non-isothermal mixed pixel can be calculated acco rding the following model:L（θ）=ε e1（θ）·L b（T 1）+ε e2（θ）·L b（T 2）The simulated result were well proved by measured radiance in the field of Yuche ng Station of CAS in Shandong province.