Abstract: Objective To analyze the availability of no starch L J medium recommended by WHO.Methods The separation rate,growth speed and drug sensitivity test of M tuberculosis were observed to compare L J medium with improved L J medium.Results The primitive separation rate of M tuberculosis cultivated in the two mediums didn't show obvious statistic difference( P >0.05),and the growth speed were similar.The total relativity rate of the drug sensitivity test was 97 3%.Conclusion It may not be necessary to add potato starch in the compound of improved L J medium.

Key words: M.tuberculosis, Medium