Abstract: For B₁ and B2_ca halogen-free low smoke flame retardant cables with small cross-section conductors,according to the current national standard GB/T 31248—2014 “Test methods for the measurement of flame spread,heat release andsmoke production on electric or optical fibre cables under fire conditions” and the European Standard BS EN 50399:2011+A1:2016. The influence of sample installation on test results is discussed by comparing the test process and test results. The comparison results can make the majority of enterprises in the B₁ and B2_ca class halogen-free low smoke flame retardant cables development process less decircuit, and put forward the current national standard GB 31247—2014 “Classification for burning behavior of eleciric and optical cables”revision of the necessity, which is helpful to solve the international trade disputes of such cable.