In this paper, we discussed the relationship between the existential construction and its related constructions based on the concept of construction in the construction grammar. There are some problems with the traditional view about existential sentence. The main cause of these problems is the different ways in which they are defined. Some people are trying to apprehend the existential sentence based on the meaning of ‘existence’, some people place the form above the meaning. But this problem does not arise if we try to apprehend it based on construction grammar. The construction is a set of form and meaning, we can distinguish existential construction and non-existential construction by formal sameness and relations of meaning. We discussed that the existential construction and its related constructions -VP+NP construction, NL+NP construction, NP+Vi+NP construction, and PP+VP+NP construction- are different. If we regard these as separate constructions, their individual characteristics can be fully understood. In addition, we can capture the relationship which exists between these through construction inheritance.