Abstract: In order to make clear reservoir heterogeneity on the steam flooding effect , the variance regularity of heavy oil reservoir heterogeneity of Louzi 27 well block in Henan oilfield has been analyzed and the research on influential factors of steam flooding has been carried out.The results put forward to reduce the heterogeneity differences and expand the displacement technology countermeasures , which includes adopting the supersaturated steam , large doses of plane profile before steam injection , timely adjustment of steam injection parameters , and timely production structure adjustment , etc.