Silique shatter strength (SSS) of 286 Brassica napus varieties (lines) was measured using a modified fracture method. Results indicated a wide variation in silique shattering resistance among these accessions. Among 146 hybrid varieties’ SSS values, 3 (2.05%) were less than 1N, 96 (65.75%) were between 1 to 2N, 47 (32.19%) were between 2 to 3N, no hybrid was found having more than 3N of SSS. The SSS of hybrids ranged between 0.82 to 2.87N, with an average of 1.83N, and CV (coefficient of variation) of 22.11%. Among 140 conventional varieties, 6 (4.29%) were less than 1N, 76 (54.29%) were between 1 to 2N, 49 (35%) were between 2 to 3N, and 9 (6.42%) were more than 3N. The SSS of conventional varieties ranged between 0.58 to 3.47N, with an average of 1.94N, and CV of 31.55. Correlations between SSS and silique- and seed-related traits showed that the SSS had highly significant positive correlations with single silique weight, unit area weight of silique wall, and 1 000-seed weight. And it had significant positive correlations with seed per silique and silique width. Analysis of the relations between hybrids and its restorers illustrated that the hybrid SSS had significant positive correlations with silique width, single silique weight, unit area weight of silique wall, and 1 000-seed weight of the restorer. Results indicated that silique size affected shattering trait. Rapeseed with large silique, thick wall and heavy seeds might have higher resistance to silique shattering. And large silique and heavy seeds of restorer lines would provide greater benefit to the shattering resistance of hybrids.