A lot of data has been accumulated with Tibet II and HD AS array operated s
uccessfully since October of 1995 and 1996, respectivley. The preliminary r
esults of searching for steady TeV gamma ray emissions from Crab Nebula wit
h these data were presented in this paper. Analysis shows that the accumula
tive excess events of steady 3TeV gamma ray emissions from Crab Nebula was
increasing stably and the statistical significance reached 3.2 sigma, where
as no statistical significant evidence of steady 10TeV and 30TeV gamma ray
emissions was found.