The article set up 2 - dementional steady heat conduction model and equations based on buried channel waveguide , and solved the equations by separating variables method . using mathcad , 2 - d temperature distribution and the influenced refractive index distribution by thermo - optic effect were plotted in waveguide section area 本文先以埋入式溝道波導(dǎo)為例,建立了二維穩(wěn)態(tài)熱傳導(dǎo)方程模型,用分離變量法推導(dǎo)了方程解,并用mathcad2000在波導(dǎo)截面上繪出了二維溫度分布圖和受到熱光效應(yīng)影響的折射率分布圖。