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BL Lacs are one subclass of blazars with highly energetic $\gamma$-rayemission, which is strongly boosted by a relativistic beaming effect. Thelatest catalogue of the 10 years of {\it Fermi}/LAT data Abdollahi et al.(2020) and the $\gamma$-ray Doppler factors in Pei et al. (2020) provide uswith a large BL Lac sample to study their jet emission morphologies andintrinsic properties. In this paper, we collected a sample of 294 {\it Fermi}BL Lacs and probed the correlations between the $\gamma$-ray emissions andluminosity distances. Our analyses give following conclusions: (1) the observed$\gamma$-ray emissions are really boosted by the $\gamma$-ray Doppler factor,and the intrinsic $\gamma$-ray emissions are closely correlated with luminositydistances. (2) the morphology of jet emissions for HBLs may be continuous,while that for IBLs may be the case of a moving sphere in the $\gamma$-raybands.

A study of Intrinsic $\gamma$-ray Emission for {\it Fermi}/LAT-detected BL Lacs