Through on-site studies about the construction characteristics of door frame parts existing in partitions of apartments and data analysis after that, the following facts are found: The amount of door frame parts' construction is more than 40% of the whole partition's; The constructional efficiency of door frame part is lower than that of the wall part; The pipes and wires play less role in constructability within door frame parts than in the wall parts. Finally, on the basis of analyses, the complicacy of using construction methods of different industrial level is discussed as well.