Grounded theory was applied to construct a theoretical model of parental grief healing in China. 54 bereaved parents’ data were obtained; their narrative texts written on the Internet were collected. Through in-depth coding and continuous correction, a four-level tree structure of concept, sub-category, category, and core-category was formed, which included four structure-core categories ("the dilemma of the secular connection," "living and psychological stress with lack of function," "the conflict of role dissonance," and "the difficulty of understanding life and death thoroughly,") and two process-core categories ("seeking hope in hopelessness" and "facing hopelessness in hope"). The “fluxion between hope and hopelessness” found among those sub-categories of the same category showed that the transformation was derived from endogenous power, and each category itself contained two opposite reversion points of hope and hopelessness. In addition, the fluxion between the paired categories of the four structural core categories, among four core categories of the same process, and between the two process-core categories presented a yī-xiāo-yī-cháng phenomenon, which can be literally translated into waxing and waning, under different conditions. The "fluxion between hope and hopelessness" at various levels and in different forms was intertwined within a gradual dynamic transformation process, which further developed a "fluxion between hope and hopelessness" model resembling a Taiji diagram. Discussion and implications of the findings were provided for theory-building, inventory-development, and practice.