Soil available boron is usually determinated using methylene amine H method (MeA H).The procedure of using boiling water to extract available boron from soil samples has to be done before determination.However,this pretreatment method has several disadvantages such as not very efficient,hard to control conditions and easy to bring errors.In this paper,the extracting procedure of MeA H for sample TCB 2 was improved using water bath or microwave.The optimized extraction time was 50 minutes and 90 seconds for water bath and for microwave respectively.The two improved extraction methods were applied to analyze available boron for national standard reference soil sample(GBW07412a),and satisfied results were achieved using both water bath and microwave.The RSD of 5 replicates were 3.43% and 8.91%, respectively.