In this paper, we analyze the definiteness of NP object in Chinese existential construction in which placement/creation-meaning existential verb appear by means of the corpus research. Placement/creation-meaning existential verb constructions are regarded as quasi-existential construction. These verbs need telic-meaning NP object for the purpose of expressing result meaning of existential construction, so we assume that `numeral + quantifier + noun` type object and `modifying components (demonstrative etc.) + noun` type object can appear in existential construction. `Modifying components (demonstrative etc.) + noun` type object has definite meaning. The corpus research lets me know that many definite `modifying components (demonstrative etc.) + noun` type object can appear in existential construction and the definiteness effect that NP object of existential construction has indefinite meaning can`t be applied to placement/creation-meaning existential verb constructions. Besides, we can find that creation-meaning existential verb has a tendency to prefer definite NP object to indefinite NP object and this tendency of creation-meaning existential verb is more strong than placement-meaning existential verb. Furthermore, this tendency of creation-meaning existential verb `xie` is more strong than creation-meaning existential verb `xiu`/`hua`.