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This experiment was conducted to study the relationship between the increase in cellulose content in developing cotton bolls and their final cotton fibre strength. The rate of cellulose increase over time was estimated using logistical regression, and the logistic equation parameters were then used to compare different cotton cultivars in different temperature environments. The increase in cellulose content followed a typical ''S'' curve, with the boll period time divided into slow-fast-slow stages. In different cultivars, the final fibre strength was closely related to the characters of the fast cellulose content increasing stage, negatively related to the maximal cellulose increasing rate (P \ 0.05), and positively related to the duration of the fast cellulose content increasing stage (P \ 0.01). In the same cultivar, low temperature reduced the maximal cellulose increasing rate and prolonged the duration of the fast cellulose increasing stage. The results indicate that, in diverse genetic background, long-lasting and tempered cellulose growth during the rapid cellulose increasing stage is of significant benefit to high strength fibre development. For closely related cotton cultivars, decreasing the maximal cellulose increasing rate and the termination of rapid cellulose increasing stage reduced fibre strength that often occurs when temperatures are low.

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