Several burials have been uncovered in the Ban Tha Si massif in recent years. These burials were placed at the bottom of rock-shelter walls painted with red ochre depicting various geometric, anthropic or animal motifs. Thus, from the painted walls of Phratu Pha, to those of Ban Tha Si and Doi Pha Kan (district of Ban Dong, Mae Moh, Province of Lampang), the flexed and extended burials provide an opportunity to document the evolution of funerary practices by mobilising the tools of archaeothanatology. The characteristics of the different burials dated to between 2900 and 3200 BP at Prathu Pha, 7047±53 BP at Ban Tha Si and from 12,930 ± 50 BP onwards at Doi Pha Kan open up new perspectives concerning the funerary practices and settlement of Northern Thailand. Beyond the classical extended/flexed position, a more detailed archaeothanatological approach of the variability of burials can provide an incremental step towards a better understanding of ancient mortuary practices in Northern Thailand and in Southeast Asia as a whole. Indeed, the descriptions of the positions of the burials in Southeast Asia still lack standardisation, which hinders comparisons between the different sites. By applying more comprehensive archaeothanatological techniques it would be possible to make comparisons between burials in Northern Thailand and those recorded at well-studied sites belonging to the Dingsishan in China, and Da But and Bacsonian in northern Vietnam. Questions also arise with regards to the resilience of certain practices, such as the use of red ochre for funerary purposes and more particularly the use (or reuse) of painted rock shelters as burial sites.